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US 5,495,832 AGranted
Valve operating device for internal combustion engine
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsNoriaki Fujii, Ichirou Ohmura
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AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsNoriaki Fujii, Ichirou Ohmura
Estimating the term…
An internal combustion engine intake valve operating mechanism for two intake valves having a separate driving rocker arm for each valve and two free rocker arms not connected to the intake valves. In a low-speed operating range, the driving rocker arms are in their disconnecting states from the free rocker arms, so that both intake valves are opened and closed by a second cam and a fourth cam. In a medium-speed operating range, the first free rocker arm and the first driving rocker arm are interconnected, so that one of the intake valves is opened and closed by a first cam and the other intake valve continues to be opened and closed by the fourth cam. In a high-speed operating range, the first driving rocker arm, the second free rocker arm and the second driving rocker arm are connected to one another, so that both the intake valves are opened and closed by a third cam. This reduces the equivalent inertial mass during connection of rocker arms and enables an increase in output and a reduction in fuel consumption in an internal combustion engine operating in multi-stages depending upon operating conditions of the engine.
A valve operating device for use in an internal combustion engine for varying operating characteristics of a pair of engine valves at multi-stages depending upon operating conditions of the engine, said device comprising a cam shaft which is provided with a first cam having a profile corresponding to a medium-speed operating range of the engine, a second cam having a profile corresponding to a low-speed operating range of the engine, a third cam having a profile corresponding to a high-speed operating range of the engine, and a fourth cam having a profile corresponding to low-speed and medium-speed operating ranges of the engine, said four cams being successively arranged in the recited order on the cam shaft;
A valve operating device for use in an internal combustion engine for varying operating characteristics of a pair of engine valves in multi-stages depending upon operating conditions of the engine, said device comprising a cam shaft having four cams with four different cam profiles, a rocker shaft having first, second, third and fourth rocker arms pivotally mounted thereon in side-by-side relationship, each rocker arm engaging a different said cam for being pivoted by the engaged cam, said second and third rocker arms separately engaging said pair of valves for operating each of said valves in response to pivoting of said rocker arm engaging said valve, and switching means provided in said four rocker arms for selectively disconnecting all four of said rocker arms in a low-speed operating range of the engine, for selective connecting said first and second rocker arms in a medium-speed operating range of the engine and for selectively connecting said second, third and fourth rocker arms in a high speed operating range of the engine, said switching means comprising switching pins slidably mounted in cylindrical bores provided in all four of said rocker arms, said switching pins including a medium-speed switching pin in said first rocker arm for movement to a position to interconnect said first rocker arm and said second rocker arm in the medium-speed operating range of the engine, a first high-speed switching pin in said third rocker arm for movement to a position to interconnect said third rocker arm and said fourth rocker arm in the high-speed operating range of the engine, and a second high-speed switching pin adjacent and operatively connected to said first high-speed switching pin and positioned in said fourth rocker arm for movement to a position to interconnect said fourth rocker arm and said second rocker arm in the high-speed operating range of the engine.
Dependencies are inferred from the claim text.